EP 0146647 B1 19871104 - METHOD OF PROCESSING MEASURED VALUES OF A GAS FRICTION VACUUM METER, AND A GAS FRICTION VACUUM METER PROVIDED WITH A CIRCUIT FOR CARRYING OUT THIS METHOD
Title (en)
METHOD OF PROCESSING MEASURED VALUES OF A GAS FRICTION VACUUM METER, AND A GAS FRICTION VACUUM METER PROVIDED WITH A CIRCUIT FOR CARRYING OUT THIS METHOD
Publication
Application
Priority
EP 83112728 A 19831217
Abstract (en)
[origin: US4640136A] A method for the processing of values measured in a gas friction vacuum meter, in which the pressure is determined by the drag on a magnetically suspended free ball, by forming a first time value tn-1 by measuring the time required for N/2 periods of revolution of the ball, and a second time value tn by the immediately following measurement of the time required for another N/2 periods of revolution of the ball, determining a pressure value by comparing the two times values, repeating this pressure value determination of two time values after each period of rotation for the same number N of periods of revolution of the ball to a total of z determinations, and displaying the average of the pressure value determined Z times. To be able to determine the pressure with optimum measurement times and uncertainties of measurement, the ratio of N to Z is selected at approximately 4:1.
IPC 1-7
IPC 8 full level
G01L 21/16 (2006.01); G01L 21/24 (2006.01)
CPC (source: EP US)
G01L 21/24 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
EP 0146647 A1 19850703; EP 0146647 B1 19871104; DE 3374346 D1 19871210; JP S60168032 A 19850831; US 4640136 A 19870203
DOCDB simple family (application)
EP 83112728 A 19831217; DE 3374346 T 19831217; JP 26467484 A 19841217; US 68037884 A 19841211